The first reaction is: 2CrI3(aq)+3Pb(NO3)2(aq)→2Cr(NO3)3(aq)+3PbI2(s) 2 \mathrm{CrI}_{3}(aq) + 3 \mathrm{Pb}\left(\mathrm{NO}_{3}\right)_{2}(aq) \rightarrow 2 \mathrm{Cr}\left(\mathrm{NO}_{3}\right)_{3}(aq) + 3 \mathrm{PbI}_{2}(s) 2CrI3(aq)+3Pb(NO3)2(aq)→2Cr(NO3)3(aq)+3PbI2(s)
This reaction involves the exchange of ions between two compounds, resulting in the formation of two new compounds. This is characteristic of a double substitution reaction.
The second reaction is: H2SO3(aq)→H2O(l)+SO2(g) \mathrm{H}_{2} \mathrm{SO}_{3}(aq) \rightarrow \mathrm{H}_{2} \mathrm{O}(l) + \mathrm{SO}_{2}(g) H2SO3(aq)→H2O(l)+SO2(g)
This reaction involves the breakdown of a single compound into two or more simpler substances. This is characteristic of a decomposition reaction.
The third reaction is: Ca(s)+F2(g)→CaF2(s) \mathrm{Ca}(s) + \mathrm{F}_{2}(g) \rightarrow \mathrm{CaF}_{2}(s) Ca(s)+F2(g)→CaF2(s)
This reaction involves the combination of two elements to form a single compound. This is characteristic of a combination reaction.
ReactionType2CrI3(aq)+3Pb(NO3)2(aq)→2Cr(NO3)3(aq)+3PbI2(s)double substitutionH2SO3(aq)→H2O(l)+SO2(g)decompositionCa(s)+F2(g)→CaF2(s)combination \begin{array}{|c|l|} \hline \text{Reaction} & \text{Type} \\ \hline 2 \mathrm{CrI}_{3}(aq) + 3 \mathrm{Pb}\left(\mathrm{NO}_{3}\right)_{2}(aq) \rightarrow 2 \mathrm{Cr}\left(\mathrm{NO}_{3}\right)_{3}(aq) + 3 \mathrm{PbI}_{2}(s) & \text{double substitution} \\ \hline \mathrm{H}_{2} \mathrm{SO}_{3}(aq) \rightarrow \mathrm{H}_{2} \mathrm{O}(l) + \mathrm{SO}_{2}(g) & \text{decomposition} \\ \hline \mathrm{Ca}(s) + \mathrm{F}_{2}(g) \rightarrow \mathrm{CaF}_{2}(s) & \text{combination} \\ \hline \end{array} Reaction2CrI3(aq)+3Pb(NO3)2(aq)→2Cr(NO3)3(aq)+3PbI2(s)H2SO3(aq)→H2O(l)+SO2(g)Ca(s)+F2(g)→CaF2(s)Typedouble substitutiondecompositioncombination
double substitution, decomposition, combination\boxed{\text{double substitution, decomposition, combination}}double substitution, decomposition, combination
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